staging: comedi: usbduxfast: convert pr_warn() to dev_warn()

Use dev_warn() to output the warning message.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/comedi/drivers/ni_pcimio.c
Simple merge